Plants continue to grow throughout their life but growth stops in animals after particular stage.
(a) Do all cells in a plant divide all the time?
(b) What name do you give in (i) cells that divide always and (ii) locations of such cells in plants?
(c) Do animals also have similar locations where cells divide? Justify your answer.
(d) What value(s) do you get from these facts?
a) No, all cells in a plant do not divide at the same time. In fact, plant growth takes place in three phases:
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- Formative phase: It is also called the phase of cell division. It occurs at root apex, shoot apex and other regions having meristematic tissue. New cells are produced by mitotic division of the meristematic cells.
- Phase of enlargement: The newly formed cells, produced in formative phase undergo enlargement.
- Phase of differentiation or maturation: The enlarged cells develop into special or particular type of cell by undergoing structural and physiological differentiation. Both structural and physiological differentiation produce various tissue and cell types. The various cell types observed in root are epidermis, cortex, vascular tissues, etc.
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